src/insets/InsetExternal.cpp

   1 /**
   2  * \file InsetExternal.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Asger Alstrup Nielsen
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "InsetExternal.h"
  14 #include "insets/ExternalSupport.h"
  15 #include "insets/RenderButton.h"
  16 #include "insets/RenderGraphic.h"
  17 #include "insets/RenderPreview.h"
  18
  19 #include "Buffer.h"
  20 #include "BufferView.h"
  21 #include "Cursor.h"
  22 #include "DispatchResult.h"
  23 #include "Exporter.h"
  24 #include "FuncStatus.h"
  25 #include "FuncRequest.h"
  26 #include "LaTeXFeatures.h"
  27 #include "Lexer.h"
  28 #include "LyX.h" // use_gui
  29 #include "LyXRC.h"
  30 #include "MetricsInfo.h"
  31 #include "OutputParams.h"
  32
  33 #include "frontends/alert.h"
  34 #include "frontends/Application.h"
  35
  36 #include "graphics/PreviewLoader.h"
  37
  38 #include "support/convert.h"
  39 #include "support/debug.h"
  40 #include "support/ExceptionMessage.h"
  41 #include "support/filetools.h"
  42 #include "support/gettext.h"
  43 #include "support/lstrings.h"
  44 #include "support/lyxlib.h"
  45 #include "support/Translator.h"
  46
  47 #include <boost/bind.hpp>
  48
  49 #include <sstream>
  50
  51 using namespace std;
  52 using namespace lyx::support;
  53
  54 namespace {
  55
  56 unsigned int const defaultLyxScale = 100;
  57
  58 string defaultTemplateName;
  59
  60 } // namespace anon
  61
  62
  63 namespace lyx {
  64
  65 namespace Alert = frontend::Alert;
  66
  67 namespace external {
  68
  69 TempName::TempName()
  70 {
  71         FileName const tempname = FileName::tempName("lyxext");
  72         // must have an extension for the converter code to work correctly.
  73         tempname_ = FileName(tempname.absFilename() + ".tmp");
  74 }
  75
  76
  77 TempName::TempName(TempName const &)
  78 {
  79         tempname_ = TempName()();
  80 }
  81
  82
  83 TempName::~TempName()
  84 {
  85         tempname_.removeFile();
  86 }
  87
  88
  89 TempName & TempName::operator=(TempName const & other)
  90 {
  91         if (this != &other)
  92                 tempname_ = TempName()();
  93         return *this;
  94 }
  95
  96 } // namespace external
  97
  98
  99 InsetExternalParams::InsetExternalParams()
 100         : display(true),
 101           lyxscale(defaultLyxScale),
 102           draft(false)
 103 {
 104         if (defaultTemplateName.empty()) {
 105                 external::TemplateManager const & etm =
 106                         external::TemplateManager::get();
 107                 templatename_ = etm.getTemplates().begin()->first;
 108         } else
 109                 templatename_ = defaultTemplateName;
 110 }
 111
 112
 113 namespace {
 114
 115 template <typename T>
 116 void clearIfNotFound(T & data, external::TransformID value,
 117                      vector<external::TransformID> const & ids)
 118 {
 119         typedef vector<external::TransformID>::const_iterator
 120                 const_iterator;
 121
 122         const_iterator it  = ids.begin();
 123         const_iterator end = ids.end();
 124         it = find(it, end, value);
 125         if (it == end)
 126                 data = T();
 127 }
 128
 129 } // namespace anon
 130
 131
 132 void InsetExternalParams::settemplate(string const & name)
 133 {
 134         templatename_ = name;
 135
 136         external::TemplateManager const & etm =
 137                 external::TemplateManager::get();
 138         external::Template const * const et = etm.getTemplateByName(name);
 139         if (!et)
 140                 // Be safe. Don't lose data.
 141                 return;
 142
 143         // Ascertain which transforms the template supports.
 144         // Empty all those that it doesn't.
 145         vector<external::TransformID> const & ids = et->transformIds;
 146         clearIfNotFound(clipdata,     external::Clip,   ids);
 147         clearIfNotFound(extradata,    external::Extra,  ids);
 148         clearIfNotFound(resizedata,   external::Resize, ids);
 149         clearIfNotFound(rotationdata, external::Rotate, ids);
 150
 151         //
 152         preview_mode = et->preview_mode;
 153 }
 154
 155
 156 void InsetExternalParams::write(Buffer const & buf, ostream & os) const
 157 {
 158         os << "External\n"
 159            << "\ttemplate " << templatename() << '\n';
 160
 161         if (!filename.empty())
 162                 os << "\tfilename " << filename.outputFilename(buf.filePath()) << '\n';
 163
 164         if (!display)
 165                 os << "\tdisplay false\n";
 166
 167         if (lyxscale != defaultLyxScale)
 168                 os << "\tlyxscale " << convert<string>(lyxscale) << '\n';
 169
 170         if (draft)
 171                 os << "\tdraft\n";
 172
 173         if (!clipdata.bbox.empty())
 174                 os << "\tboundingBox " << clipdata.bbox << '\n';
 175         if (clipdata.clip)
 176                 os << "\tclip\n";
 177
 178         external::ExtraData::const_iterator it  = extradata.begin();
 179         external::ExtraData::const_iterator end = extradata.end();
 180         for (; it != end; ++it) {
 181                 if (!it->second.empty())
 182                         os << "\textra " << it->first << " \""
 183                            << it->second << "\"\n";
 184         }
 185
 186         if (!rotationdata.no_rotation()) {
 187                 os << "\trotateAngle " << rotationdata.adjAngle() << '\n';
 188                 if (rotationdata.origin() != external::RotationData::DEFAULT)
 189                         os << "\trotateOrigin "
 190                            << rotationdata.originString() << '\n';
 191         }
 192
 193         if (!resizedata.no_resize()) {
 194                 double const scl = convert<double>(resizedata.scale);
 195                 if (!float_equal(scl, 0.0, 0.05)) {
 196                         if (!float_equal(scl, 100.0, 0.05))
 197                                 os << "\tscale "
 198                                    << resizedata.scale << '\n';
 199                 } else {
 200                         if (!resizedata.width.zero())
 201                                 os << "\twidth "
 202                                    << resizedata.width.asString() << '\n';
 203                         if (!resizedata.height.zero())
 204                                 os << "\theight "
 205                                    << resizedata.height.asString() << '\n';
 206                 }
 207                 if (resizedata.keepAspectRatio)
 208                         os << "\tkeepAspectRatio\n";
 209         }
 210 }
 211
 212
 213 bool InsetExternalParams::read(Buffer const & buffer, Lexer & lex)
 214 {
 215         enum {
 216                 EX_TEMPLATE = 1,
 217                 EX_FILENAME,
 218                 EX_DISPLAY,
 219                 EX_LYXSCALE,
 220                 EX_DRAFT,
 221                 EX_BOUNDINGBOX,
 222                 EX_CLIP,
 223                 EX_EXTRA,
 224                 EX_HEIGHT,
 225                 EX_KEEPASPECTRATIO,
 226                 EX_ROTATEANGLE,
 227                 EX_ROTATEORIGIN,
 228                 EX_SCALE,
 229                 EX_WIDTH,
 230                 EX_END
 231         };
 232
 233         LexerKeyword external_tags[] = {
 234                 { "\\end_inset",     EX_END },
 235                 { "boundingBox",     EX_BOUNDINGBOX },
 236                 { "clip",            EX_CLIP },
 237                 { "display",         EX_DISPLAY},
 238                 { "draft",           EX_DRAFT},
 239                 { "extra",           EX_EXTRA },
 240                 { "filename",        EX_FILENAME},
 241                 { "height",          EX_HEIGHT },
 242                 { "keepAspectRatio", EX_KEEPASPECTRATIO },
 243                 { "lyxscale",        EX_LYXSCALE},
 244                 { "rotateAngle",     EX_ROTATEANGLE },
 245                 { "rotateOrigin",    EX_ROTATEORIGIN },
 246                 { "scale",           EX_SCALE },
 247                 { "template",        EX_TEMPLATE },
 248                 { "width",           EX_WIDTH }
 249         };
 250
 251         PushPopHelper pph(lex, external_tags);
 252
 253         bool found_end  = false;
 254         bool read_error = false;
 255
 256         while (lex.isOK()) {
 257                 switch (lex.lex()) {
 258                 case EX_TEMPLATE:
 259                         lex.next();
 260                         templatename_ = lex.getString();
 261                         break;
 262
 263                 case EX_FILENAME: {
 264                         lex.eatLine();
 265                         string const name = lex.getString();
 266                         filename.set(name, buffer.filePath());
 267                         break;
 268                 }
 269
 270                 case EX_DISPLAY: {
 271                         lex.next();
 272                         display = lex.getString() != "false";
 273                         break;
 274                 }
 275
 276                 case EX_LYXSCALE:
 277                         lex.next();
 278                         lyxscale = lex.getInteger();
 279                         break;
 280
 281                 case EX_DRAFT:
 282                         draft = true;
 283                         break;
 284
 285                 case EX_BOUNDINGBOX:
 286                         lex.next();
 287                         clipdata.bbox.xl = lex.getInteger();
 288                         lex.next();
 289                         clipdata.bbox.yb = lex.getInteger();
 290                         lex.next();
 291                         clipdata.bbox.xr = lex.getInteger();
 292                         lex.next();
 293                         clipdata.bbox.yt = lex.getInteger();
 294                         break;
 295
 296                 case EX_CLIP:
 297                         clipdata.clip = true;
 298                         break;
 299
 300                 case EX_EXTRA: {
 301                         lex.next();
 302                         string const name = lex.getString();
 303                         lex.next();
 304                         extradata.set(name, lex.getString());
 305                         break;
 306                 }
 307
 308                 case EX_HEIGHT:
 309                         lex.next();
 310                         resizedata.height = Length(lex.getString());
 311                         break;
 312
 313                 case EX_KEEPASPECTRATIO:
 314                         resizedata.keepAspectRatio = true;
 315                         break;
 316
 317                 case EX_ROTATEANGLE:
 318                         lex.next();
 319                         rotationdata.angle = lex.getString();
 320                         break;
 321
 322                 case EX_ROTATEORIGIN:
 323                         lex.next();
 324                         rotationdata.origin(lex.getString());
 325                         break;
 326
 327                 case EX_SCALE:
 328                         lex.next();
 329                         resizedata.scale = lex.getString();
 330                         break;
 331
 332                 case EX_WIDTH:
 333                         lex.next();
 334                         resizedata.width = Length(lex.getString());
 335                         break;
 336
 337                 case EX_END:
 338                         found_end = true;
 339                         break;
 340
 341                 default:
 342                         lex.printError("ExternalInset::read: Wrong tag: $$Token");
 343                         read_error = true;
 344                         break;
 345                 }
 346
 347                 if (found_end || read_error)
 348                         break;
 349         }
 350
 351         if (!found_end)
 352                 lex.printError("ExternalInsetParams::read: Missing \\end_inset.");
 353
 354         // This is a trick to make sure that the data are self-consistent.
 355         settemplate(templatename_);
 356
 357         if (lyxerr.debugging(Debug::EXTERNAL)) {
 358                 lyxerr  << "InsetExternalParams::read:\n";
 359                 write(buffer, lyxerr);
 360         }
 361
 362         return !read_error;
 363 }
 364
 365
 366 InsetExternal::InsetExternal(Buffer & buf)
 367         : renderer_(new RenderButton)
 368 {
 369         Inset::setBuffer(buf);
 370 }
 371
 372
 373 InsetExternal::InsetExternal(InsetExternal const & other)
 374         : Inset(other),
 375           boost::signals::trackable(),
 376           params_(other.params_),
 377           renderer_(other.renderer_->clone(this))
 378 {}
 379
 380
 381 InsetExternal::~InsetExternal()
 382 {
 383         hideDialogs("external", this);
 384 }
 385
 386
 387 void InsetExternal::statusChanged() const
 388 {
 389         updateFrontend();
 390 }
 391
 392
 393 void InsetExternal::doDispatch(Cursor & cur, FuncRequest & cmd)
 394 {
 395         switch (cmd.action) {
 396
 397         case LFUN_INSET_EDIT: {
 398                 InsetExternalParams p =  params();
 399                 if (!cmd.argument().empty())
 400                         string2params(to_utf8(cmd.argument()), buffer(), p);
 401                 external::editExternal(p, buffer());
 402                 break;
 403         }
 404
 405         case LFUN_INSET_MODIFY: {
 406                 InsetExternalParams p;
 407                 string2params(to_utf8(cmd.argument()), buffer(), p);
 408                 setParams(p);
 409                 break;
 410         }
 411
 412         case LFUN_INSET_DIALOG_UPDATE:
 413                 cur.bv().updateDialog("external",
 414                         params2string(params(), cur.bv().buffer()));
 415                 break;
 416
 417         case LFUN_MOUSE_RELEASE:
 418                 if (!cur.selection() && cmd.button() == mouse_button::button1)
 419                         cur.bv().showDialog("external",
 420                                 params2string(params(), cur.bv().buffer()),
 421                                 this);
 422                 break;
 423
 424         default:
 425                 Inset::doDispatch(cur, cmd);
 426         }
 427 }
 428
 429
 430 bool InsetExternal::getStatus(Cursor & cur, FuncRequest const & cmd,
 431                 FuncStatus & flag) const
 432 {
 433         switch (cmd.action) {
 434
 435         case LFUN_INSET_EDIT:
 436         case LFUN_INSET_MODIFY:
 437         case LFUN_INSET_DIALOG_UPDATE:
 438         case LFUN_INSET_SETTINGS:
 439                 flag.setEnabled(true);
 440                 return true;
 441
 442         default:
 443                 return Inset::getStatus(cur, cmd, flag);
 444         }
 445 }
 446
 447
 448 void InsetExternal::edit(Cursor & cur, bool, EntryDirection)
 449 {
 450         showInsetDialog(&cur.bv());
 451 }
 452
 453
 454 bool InsetExternal::showInsetDialog(BufferView * bv) const
 455 {
 456         bv->showDialog("external", params2string(params(), bv->buffer()),
 457                 const_cast<InsetExternal *>(this));
 458         return true;
 459 }
 460
 461
 462 void InsetExternal::metrics(MetricsInfo & mi, Dimension & dim) const
 463 {
 464         renderer_->metrics(mi, dim);
 465 }
 466
 467
 468 void InsetExternal::draw(PainterInfo & pi, int x, int y) const
 469 {
 470         renderer_->draw(pi, x, y);
 471 }
 472
 473
 474 namespace {
 475
 476 graphics::Params get_grfx_params(InsetExternalParams const & eparams)
 477 {
 478         graphics::Params gparams;
 479
 480         gparams.filename = eparams.filename;
 481         gparams.scale = eparams.lyxscale;
 482         if (eparams.clipdata.clip)
 483                 gparams.bb = eparams.clipdata.bbox;
 484         gparams.angle = convert<double>(eparams.rotationdata.adjAngle());
 485         gparams.display = eparams.display;
 486
 487         return gparams;
 488 }
 489
 490
 491 docstring screenLabel(InsetExternalParams const & params,
 492                             Buffer const & buffer)
 493 {
 494         external::Template const * const ptr =
 495                 external::getTemplatePtr(params);
 496         if (!ptr)
 497                 // FIXME UNICODE
 498                 return bformat((_("External template %1$s is not installed")),
 499                                         from_utf8(params.templatename()));
 500         // FIXME UNICODE
 501         docstring gui = _(ptr->guiName);
 502         return from_utf8(external::doSubstitution(params, buffer,
 503                                 to_utf8(gui), false));
 504 }
 505
 506 } // namespace anon
 507
 508
 509 static bool isPreviewWanted(InsetExternalParams const & params)
 510 {
 511         return params.display && params.filename.isReadableFile();
 512 }
 513
 514
 515 static docstring latexString(InsetExternal const & inset)
 516 {
 517         odocstringstream os;
 518         // We don't need to set runparams.encoding since it is not used by
 519         // latex().
 520         OutputParams runparams(0);
 521         runparams.flavor = OutputParams::LATEX;
 522         inset.latex(os, runparams);
 523         return os.str();
 524 }
 525
 526
 527 static void add_preview_and_start_loading(RenderMonitoredPreview & renderer,
 528                                    InsetExternal const & inset,
 529                                    Buffer const & buffer)
 530 {
 531         InsetExternalParams const & params = inset.params();
 532
 533         if (RenderPreview::status() != LyXRC::PREVIEW_OFF &&
 534             isPreviewWanted(params)) {
 535                 renderer.setAbsFile(params.filename);
 536                 docstring const snippet = latexString(inset);
 537                 renderer.addPreview(snippet, buffer);
 538                 renderer.startLoading(buffer);
 539         }
 540 }
 541
 542
 543 InsetExternalParams const & InsetExternal::params() const
 544 {
 545         return params_;
 546 }
 547
 548
 549 void InsetExternal::updatePreview()
 550 {
 551         setParams(params_);
 552 }
 553
 554
 555 void InsetExternal::setParams(InsetExternalParams const & p)
 556 {
 557         params_ = p;
 558
 559         // Subsequent calls to the InsetExternal::Params default constructor
 560         // will use this.
 561         defaultTemplateName = params_.templatename();
 562
 563         if (!external::getTemplatePtr(params_) || params_.filename.empty()
 564                 || !params_.display
 565                 || !lyxrc.display_graphics
 566                 || params_.preview_mode == PREVIEW_OFF
 567                 || (params_.preview_mode == PREVIEW_INSTANT
 568                     && RenderPreview::status() == LyXRC::PREVIEW_OFF)) {
 569                 RenderButton * button_ptr = renderer_->asButton();
 570                 if (!button_ptr) {
 571                         renderer_.reset(new RenderButton);
 572                         button_ptr = renderer_->asButton();
 573                 }
 574                 button_ptr->update(screenLabel(params_, buffer()), true);
 575                 return;
 576         }
 577
 578         switch (params_.preview_mode) {
 579         case PREVIEW_OFF:
 580                 // Already taken care of above.
 581                 LASSERT(false, return);
 582                 break;
 583         case PREVIEW_INSTANT: {
 584                 RenderMonitoredPreview * preview_ptr = renderer_->asMonitoredPreview();
 585                 renderer_.reset(new RenderMonitoredPreview(this));
 586                 preview_ptr = renderer_->asMonitoredPreview();
 587                 preview_ptr->fileChanged(boost::bind(&InsetExternal::fileChanged, this));
 588                 if (preview_ptr->monitoring())
 589                         preview_ptr->stopMonitoring();
 590                 add_preview_and_start_loading(*preview_ptr, *this, buffer());
 591                 break;
 592         }
 593         case PREVIEW_GRAPHICS: {
 594                 RenderGraphic * graphic_ptr = renderer_->asGraphic();
 595                 if (!graphic_ptr) {
 596                         renderer_.reset(new RenderGraphic(this));
 597                         graphic_ptr = renderer_->asGraphic();
 598                 }
 599                 graphic_ptr->update(get_grfx_params(params_));
 600                 break;
 601         }
 602         }
 603 }
 604
 605
 606 void InsetExternal::fileChanged() const
 607 {
 608         Buffer const * const buffer = updateFrontend();
 609         if (!buffer)
 610                 return;
 611
 612         RenderMonitoredPreview * const ptr = renderer_->asMonitoredPreview();
 613         LASSERT(ptr, /**/);
 614
 615         ptr->removePreview(*buffer);
 616         add_preview_and_start_loading(*ptr, *this, *buffer);
 617 }
 618
 619
 620 void InsetExternal::write(ostream & os) const
 621 {
 622         params_.write(buffer(), os);
 623 }
 624
 625
 626 void InsetExternal::read(Lexer & lex)
 627 {
 628         InsetExternalParams params;
 629         if (params.read(buffer(), lex))
 630                 setParams(params);
 631 }
 632
 633
 634 int InsetExternal::latex(odocstream & os, OutputParams const & runparams) const
 635 {
 636         if (params_.draft) {
 637                 // FIXME UNICODE
 638                 os << "\\fbox{\\ttfamily{}"
 639                    << from_utf8(params_.filename.outputFilename(buffer().filePath()))
 640                    << "}\n";
 641                 return 1;
 642         }
 643
 644         // "nice" means that the buffer is exported to LaTeX format but not
 645         // run through the LaTeX compiler.
 646         // If we're running through the LaTeX compiler, we should write the
 647         // generated files in the buffer's temporary directory.
 648         bool const external_in_tmpdir = !runparams.nice;
 649         bool const dryrun = runparams.dryrun || runparams.inComment;
 650
 651         // If the template has specified a PDFLaTeX output, then we try and
 652         // use that.
 653         if (runparams.flavor == OutputParams::PDFLATEX) {
 654                 external::Template const * const et_ptr =
 655                         external::getTemplatePtr(params_);
 656                 if (!et_ptr)
 657                         return 0;
 658                 external::Template const & et = *et_ptr;
 659
 660                 external::Template::Formats::const_iterator cit =
 661                         et.formats.find("PDFLaTeX");
 662
 663                 if (cit != et.formats.end()) {
 664                         return external::writeExternal(params_, "PDFLaTeX",
 665                                                        buffer(), os,
 666                                                        *(runparams.exportdata),
 667                                                        external_in_tmpdir,
 668                                                        dryrun);
 669                 }
 670         }
 671
 672         return external::writeExternal(params_, "LaTeX", buffer(), os,
 673                                        *(runparams.exportdata),
 674                                        external_in_tmpdir,
 675                                        dryrun);
 676 }
 677
 678
 679 int InsetExternal::plaintext(odocstream & os,
 680                              OutputParams const & runparams) const
 681 {
 682         os << '\n'; // output external material on a new line
 683         external::writeExternal(params_, "Ascii", buffer(), os,
 684                                 *(runparams.exportdata), false,
 685                                 runparams.dryrun || runparams.inComment);
 686         return PLAINTEXT_NEWLINE;
 687 }
 688
 689
 690 int InsetExternal::docbook(odocstream & os,
 691                            OutputParams const & runparams) const
 692 {
 693         return external::writeExternal(params_, "DocBook", buffer(), os,
 694                                        *(runparams.exportdata), false,
 695                                        runparams.dryrun || runparams.inComment);
 696 }
 697
 698
 699 void InsetExternal::validate(LaTeXFeatures & features) const
 700 {
 701         if (params_.draft)
 702                 return;
 703
 704         external::Template const * const et_ptr =
 705                 external::getTemplatePtr(params_);
 706         if (!et_ptr)
 707                 return;
 708         external::Template const & et = *et_ptr;
 709
 710         string format;
 711         switch (features.runparams().flavor) {
 712         case OutputParams::LATEX:
 713                 format = "LaTeX";
 714                 break;
 715         case OutputParams::PDFLATEX:
 716         case OutputParams::XETEX:
 717                 format = "PDFLaTeX";
 718                 break;
 719         case OutputParams::XML:
 720                 format = "DocBook";
 721                 break;
 722         }
 723         external::Template::Formats::const_iterator cit =
 724                 et.formats.find(format);
 725
 726         if (cit == et.formats.end()) {
 727                 // If the template has not specified a PDFLaTeX output,
 728                 // we try the LaTeX format.
 729                 if (format == "PDFLaTeX") {
 730                         cit = et.formats.find("LaTeX");
 731                         if (cit == et.formats.end())
 732                                 return;
 733                 } else
 734                         return;
 735         }
 736
 737         // FIXME: We don't need that always
 738         features.require("lyxdot");
 739
 740         vector<string>::const_iterator it  = cit->second.requirements.begin();
 741         vector<string>::const_iterator end = cit->second.requirements.end();
 742         for (; it != end; ++it)
 743                 features.require(*it);
 744
 745         external::TemplateManager & etm = external::TemplateManager::get();
 746
 747         it  = cit->second.preambleNames.begin();
 748         end = cit->second.preambleNames.end();
 749         for (; it != end; ++it) {
 750                 string const preamble = etm.getPreambleDefByName(*it);
 751                 if (!preamble.empty())
 752                         features.addPreambleSnippet(preamble);
 753         }
 754 }
 755
 756
 757 void InsetExternal::addPreview(graphics::PreviewLoader & ploader) const
 758 {
 759         RenderMonitoredPreview * const ptr = renderer_->asMonitoredPreview();
 760         if (!ptr)
 761                 return;
 762
 763         if (isPreviewWanted(params())) {
 764                 ptr->setAbsFile(params_.filename);
 765                 docstring const snippet = latexString(*this);
 766                 ptr->addPreview(snippet, ploader);
 767         }
 768 }
 769
 770
 771 docstring InsetExternal::contextMenu(BufferView const &, int, int) const
 772 {
 773         return from_ascii("context-external");
 774 }
 775
 776
 777 void InsetExternal::string2params(string const & in, Buffer const & buffer,
 778         InsetExternalParams & params)
 779 {
 780         params = InsetExternalParams();
 781         if (in.empty())
 782                 return;
 783
 784         istringstream data(in);
 785         Lexer lex;
 786         lex.setStream(data);
 787
 788         string name;
 789         lex >> name;
 790         if (!lex || name != "external") {
 791                 LYXERR0("InsetExternal::string2params(" << in << ")\n"
 792                                           "Expected arg 1 to be \"external\"\n");
 793                 return;
 794         }
 795
 796         // This is part of the inset proper that is usually swallowed
 797         // by Text::readInset
 798         string id;
 799         lex >> id;
 800         if (!lex || id != "External") {
 801                 LYXERR0("InsetExternal::string2params(" << in << ")\n"
 802                                           "Expected arg 2 to be \"External\"\n");
 803                 return;
 804         }
 805
 806         params.read(buffer, lex);
 807 }
 808
 809
 810 string InsetExternal::params2string(InsetExternalParams const & params,
 811         Buffer const & buffer)
 812 {
 813         ostringstream data;
 814         data << "external" << ' ';
 815         params.write(buffer, data);
 816         data << "\\end_inset\n";
 817         return data.str();
 818 }
 819
 820 } // namespace lyx